EP0037064B1 - Apparatus for transporting printing plates - Google Patents

Apparatus for transporting printing plates Download PDF

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Publication number
EP0037064B1
EP0037064B1 EP81102231A EP81102231A EP0037064B1 EP 0037064 B1 EP0037064 B1 EP 0037064B1 EP 81102231 A EP81102231 A EP 81102231A EP 81102231 A EP81102231 A EP 81102231A EP 0037064 B1 EP0037064 B1 EP 0037064B1
Authority
EP
European Patent Office
Prior art keywords
printing form
plate
printing
lifting cylinder
suction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81102231A
Other languages
German (de)
French (fr)
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EP0037064A3 (en
EP0037064A2 (en
Inventor
Klaus-Peter Schön
Günter Back
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoechst AG
Original Assignee
Hoechst AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoechst AG filed Critical Hoechst AG
Publication of EP0037064A2 publication Critical patent/EP0037064A2/en
Publication of EP0037064A3 publication Critical patent/EP0037064A3/en
Application granted granted Critical
Publication of EP0037064B1 publication Critical patent/EP0037064B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/0808—Suction grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/08—Feeding articles separated from piles; Feeding articles to machines by grippers, e.g. suction grippers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/58—Baseboards, masking frames, or other holders for the sensitive material
    • G03B27/585—Handling cut photosensitive sheets

Definitions

  • the invention relates to a device for the transport of printing forms, which are stacked in a magazine, to an exposure station with the aid of suction air.
  • a device for the electrophotographic production of printing forms in which the individual printing form is lifted from a stack in a plate magazine by a transport device, which consists of a transport carriage with a vacuum suction device and which forms the printing form into one Exposure stage transported.
  • a corona charging station for the electrostatic charging of the printing plates is arranged on the front of the transport carriage and extends transversely to the direction of movement of the transport carriage.
  • the transport carriage runs over two guide rails and can be driven by a motor which is arranged on the upper side and which meshes with a rack and pinion drive which is arranged parallel to the direction of movement of the transport carriage.
  • This has a vacuum plate on the underside, which is connected to a vacuum pump via a number of holes.
  • a negative pressure is generated, through which this pressure plate is sucked onto the vacuum plate.
  • the motor vehicle is then moved towards the exposure stage using the motor. As soon as it has reached its position above the exposure stage, the exposure stage is lowered and the vacuum of the vacuum plate is released, so that the printing plate is released and placed on the exposure stage.
  • This is also designed as a vacuum plate and is subjected to negative pressure, so that the pressure plate is pressed firmly against the exposure stage.
  • the pressure plates in the plate magazine are stacked with the photoconductive layer upwards and are sucked with the coated side onto the vacuum plate of the transport carriage.
  • the printing plates that are still in the magazine can be pre-exposed by the incident light, which can affect the print quality of the finished plate.
  • the photoconductive coated side of the printing plate is touched with suction devices, which allow the printing plate to be transported much more gently in comparison to rolls or belts in known devices, but mechanical or physical defects on the finished printing plate cannot be excluded .
  • DE-A1-2 516 884 describes a removal device for stacked glass panes which has a pivotable lifting cylinder with a piston rod which moves a suction plate back and forth.
  • the lifting cylinder is connected to one leg of an angular swivel arm, the swiveling movement of which is transmitted from a geared motor, is transmitted via a rotating crank, a push rod and a further rotating crank, which is connected to the swivel arm via a shaft.
  • a pivotable lifting cylinder with a piston rod which carries a reciprocating suction plate which lifts glass panes from a stack, the lifting cylinder being pivoted about an axis of rotation between a receiving and a depositing position.
  • a transport station for printing plates which comprises a stacking area in which there is a supply of printing plates.
  • a paper tray is available for the paper sheets between two plates.
  • the pressure plates are transported from the stacking area to a conveyor belt by a control mechanism that has a number of suction cups.
  • the control mechanism is pivotally attached to a guide rod which is connected to a motor via a gear in order to be able to perform a lateral sliding movement back and forth.
  • the uppermost pressure plate is sucked in by at least four suction cups of the control mechanism.
  • the control mechanism pivots upwards and at the same time the guide rod is mechanically moved onto the conveyor belt. If the vacuum in the suction cups is released, the control mechanism lowers down and places the pressure plate on the conveyor belt.
  • a second control mechanism above the intermediate paper sheet grabs the paper sheet, lifts it up and conveys it to the paper tray.
  • the conveyor belt transports the printing plate onto an exposure stage which has a number of holes in its surface and forms a chamber which is connected to a vacuum pump via a suction line.
  • the printing plate after it has taken the correct position on the surface of the exposure stage, is created by creating a vacuum this held.
  • the printing plate is exposed using an exposure system which has a movable carriage carriage on which a corona charging device and a light-reflecting mirror are arranged.
  • a laser for the emission of modulated laser light is arranged in such a way that the light beam emitted by the laser is deflected by the mirror and strikes in a plane approximately perpendicular to the surface of the printing plate lying on the exposure stage.
  • the object of the invention is to improve a device of the type described at the outset so that the coated photoconductive side of the printing plate is not mechanically touched during transport from the plate magazine to the exposure stage and is largely protected against pre-exposure.
  • a device of the type described in the introduction in that a lifting cylinder which can be pivoted about an axis is equipped with a piston rod which can be moved out of and into the lifting cylinder and which acts on the uncoated side of the printing form for suction elements for suction and settling carries the uppermost printing form of the stack and that an air nozzle is arranged above the magazine, the air flow of which is directed almost tangentially to the coated side of the printing form as soon as the lifting cylinder lifts the printing form from the stack to protect a sheet against the coated side of the printing form Detach damage from the printing form.
  • the suction elements for sucking, holding and depositing the printing form on a horizontal conveyor track are arranged on a bowl-shaped plate which is connected to the piston rod as a holder for the suction elements.
  • This conveyor track can be a table, along which the printing form is transported to an exposure table arranged behind it.
  • the magazine is arranged inclined to the vertical, the lifting cylinder in its receiving position being directed perpendicularly onto the uncoated side of the uppermost printing form and the bowl-shaped plate running parallel to the uncoated side of the printing form and onto this for lifting the top plate from the latter The stack is lowered until the suction elements are seated on the printing form.
  • the advantage is achieved that the printing form, for example a printing plate, which lies with its photoconductive coated side down in the plate stack, is sucked in by means of the rotatable swivel cylinder or lifting cylinder on its uncoated side and brought into a horizontal position in which its coated side faces up and in this position the transport to the exposure table takes place.
  • This ensures that the photoconductive layer of the printing plate is neither mechanically touched nor pre-exposed during the entire transport from the plate magazine to the exposure stage.
  • a transport station for the printing plates 9 comprises a pivotable lifting cylinder 2 with a piston rod 7 which can be moved out of and into the lifting cylinder.
  • the printing plates 9 are stacked in a magazine 10 in such a way that each individual printing plate within a stack 1 is coated with its photoconductive material Comes to lie side down.
  • the printing plates are provided with a sheet 19 of paper, plastic, film or the like material on their underside, so that this sheet comes to rest between two printing plates 9.
  • the piston rod 7 carries at the end protruding from the lifting cylinder 2 a bowl-shaped plate 8 to which a plurality of suction elements 3 are fastened.
  • the lifting cylinder can be pivoted about a pivot point 11 from an oblique position into a vertical position, as is indicated by the double arrow A-A.
  • the magazine 10 is arranged inclined to the vertical and at its upper end an air nozzle 13 is provided on an angled support arm 20.
  • the air nozzle 13 is aligned such that the air flow is directed almost tangentially to the underside of the pressure plate 9 as soon as the lifting cylinder 2 lifts the pressure plate from the stack 1.
  • the lifting cylinder 2 In its receiving position, the lifting cylinder 2 is pivoted about the pivot point 11 in such a way that it is directed perpendicularly onto the uncoated side of the uppermost printing plate 9.
  • the bowl-shaped plate 8 runs parallel to the uncoated side of the pressure plate 9 and is placed on this.
  • the suction elements 3 for sucking and holding the pressure plate 9 are subjected to negative pressure and the piston rod 7 is partially moved into the lifting cylinder until the pressure plate 9 assumes the position shown in broken lines in the drawing.
  • the air flow from the air nozzle 13 directed almost tangentially onto the photoconductive layer on the underside of the pressure plate 9 largely detaches the sheet 19, which protects the coated side of the pressure plate 9 from damage, from the underside of the pressure plate 9.
  • the sheet 19, generally a sheet of paper, is blown by the air stream into a collecting trough 21 arranged below the exposure table 4.
  • the lifting cylinder 2 is pivoted about the pivot point 11 into its vertical position, so that the pressure plate 9 comes to lie in the plane of a conveyor track 12.
  • the swivel angle of the lifting cylinder 2 from the inclined receiving position of the pressure plate 9 in the magazine 10 to the horizontal setting position on the conveyor track 12 is greater than 90 ° and is generally in a range between 120 ° to 150 °.
  • rollers 14 which have a groove. These rollers lie with the grooves on the opposite longitudinal side edges of the pressure plate 9.
  • the pressure plate 9 comes to lie on the exposure table 4 on a vacuum plate and as soon as it is has taken its position on the exposure table 4, it is held in place by creating a vacuum.
  • a corona 15 is fastened to the underside of the exposure carriage 16, which charges the printing plate 9 when the exposure carriage 16 is moved horizontally, which plate is then exposed. After the printing plate 9 has been exposed, it is transported on to the developer table 5 by the rollers 14.
  • the developer table 5 is connected to a drive shaft 6 arranged underneath, along which it can be horizontally pushed back and forth in the direction of the double arrow B-B.
  • Above the developer table is a developer device 17, which drives a developer coating consisting of a mixture of carrier particles and toner from above via a magnetic brush to the surface of the printing plate 9, while the printing plate 9 is guided past the developer device 17.
  • the developed printing plate is then transported to a fixing device, not shown, in which the imagewise distributed toner is fixed or melted on the printing plate surface by the action of radiant heat.
  • the imaged printing plate then passes from the fixing device to a stripping device in which the image areas on the photoconductive layer are removed, so that the printing plate is then suitable for use in an offset printing machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Projection-Type Copiers In General (AREA)

Description

Die Erfindung betrifft eine Vorrichtung für den Transport von Druckformen , die in einem Magazin gestapelt sind, zu einer Belichtungsstation mit Hilfe von Saugluft.The invention relates to a device for the transport of printing forms, which are stacked in a magazine, to an exposure station with the aid of suction air.

Die Herstellung von beschrifteten und bebilderten Druckplatten, die unmittelbar zum Drukken geeignet sind, geschieht in der Weise, daß diese Druckplatten zuerst elektrostatisch aufgeladen und anschließend eine Vorlage bildmäßig auf die einzelne Druckplatte projiziert wird. Nach Beendigung dieses Belichtungsvorgangs wird die Druckplatte mit einem Entwickler entwickelt, fixiert und entschichtet, wonach sie fertig für den Druck ist.The production of labeled and illustrated printing plates, which are directly suitable for printing, is done in such a way that these printing plates are first electrostatically charged and then an original is projected onto the individual printing plate. After completing this exposure process, the printing plate is developed, fixed and stripped with a developer, after which it is ready for printing.

Aus der DE-B-2 462 216 ist ein Gerät zur elektrofotografischen Herstellung von Druckformen bekannt, bei dem die einzelne Druckform von einem Stapel in einem Plattenmagazin durch eine Transportvorrichtung abgehoben wird, die aus einem Transportwagen mit einer Unterdrucksaugeinrichtung besteht und welche die Druckform zu einer Belichtungsbühne transportiert. Um das Aufladen der einzelnen Druckformen zeitsparend mit deren Transport zu der Belichtungsbühne zu verbinden, ist eine Corona-Aufladestation für die elektrostatische Aufladung der Druckplatten an der Vorderseite des Transportwagens angeordnet und erstreckt sich quer zur Bewegungsrichtung des Transportwagens. Der Transportwagen läuft über zwei Führungsschienen und ist von einem auf der Oberseite angeordneten Motor antreibbar, der über ein Zahnrad mit einem Zahnstangentrieb im Eingriff steht, der parallel zu der Bewegungsrichtung des Transportwagens angeordnet ist. Dieser weist an der Unterseite eine Vakuumplatte auf, die über eine Anzahl von Löchern mit einer Vakuumpumpe in Verbindung steht. Beim Aufsetzen des Transportwagens auf die Oberseite der obersten Druckplatte im Plattenmagazin wird ein Unterdruck erzeugt, durch den diese Druckplatte an die Vakuumplatte angesaugt wird. Danach wird der Transportwagen mit Hilfe des Motors in Richtung der Belichtungsbühne verfahren. Sobald er seine Position oberhalb der Belichtungsbühne erreicht hat, erfolgt eine Absenkung auf die Belichtungsbühne und das Aufheben des Vakuums der Vakuumplatte, so daß die Druckplatte freigegeben und auf die Belichtungsbühne abgesetzt wird. Diese ist gleichfalls als Vakuumplatte ausgebildet und wird mit Unterdruck beaufschlagt, so daß die Druckplatte fest gegen die Belichtungsbühne gepreßt wird.From DE-B-2 462 216 a device for the electrophotographic production of printing forms is known, in which the individual printing form is lifted from a stack in a plate magazine by a transport device, which consists of a transport carriage with a vacuum suction device and which forms the printing form into one Exposure stage transported. In order to combine the charging of the individual printing forms with their transport to the exposure stage in a time-saving manner, a corona charging station for the electrostatic charging of the printing plates is arranged on the front of the transport carriage and extends transversely to the direction of movement of the transport carriage. The transport carriage runs over two guide rails and can be driven by a motor which is arranged on the upper side and which meshes with a rack and pinion drive which is arranged parallel to the direction of movement of the transport carriage. This has a vacuum plate on the underside, which is connected to a vacuum pump via a number of holes. When the transport carriage is placed on the top of the uppermost pressure plate in the plate magazine, a negative pressure is generated, through which this pressure plate is sucked onto the vacuum plate. The motor vehicle is then moved towards the exposure stage using the motor. As soon as it has reached its position above the exposure stage, the exposure stage is lowered and the vacuum of the vacuum plate is released, so that the printing plate is released and placed on the exposure stage. This is also designed as a vacuum plate and is subjected to negative pressure, so that the pressure plate is pressed firmly against the exposure stage.

Bei diesem bekannten Gerät sind die Druckplatten im Plattenmagazin mit der fotoleitenden Schicht nach oben gestapelt und werden mit der beschichteten Seite an die Vakuumplatte des Transportwagens angesaugt. Beim Einlegen eines neuen Stapels in das Plattenmagazin oder beim Öffnen des Geräts können die im Magazin noch vorhandenen Druckplatten durch das einfallende Licht vorbelichtet werden, wodurch dann die Druckqualität der fertig entwickelten Platte leiden kann. Beim Abheben der einzelnen Druckplatte vom Stapel wird die fotoleitende beschichtete Seite der Druckplatte mit Saugeinrichtungen berührt, die zwar einen wesentlich schonenderen Transport der Druckplatte im Vergleich zu Rollen oder Bändern bei bekannten Geräten ermöglichen, jedoch können mechanische oder physikalische Fehlstellen auf der fertigentwickelten Druckplatte nicht ausgeschlossen werden.In this known device, the pressure plates in the plate magazine are stacked with the photoconductive layer upwards and are sucked with the coated side onto the vacuum plate of the transport carriage. When a new stack is inserted in the plate magazine or when the device is opened, the printing plates that are still in the magazine can be pre-exposed by the incident light, which can affect the print quality of the finished plate. When the individual printing plate is lifted off the stack, the photoconductive coated side of the printing plate is touched with suction devices, which allow the printing plate to be transported much more gently in comparison to rolls or belts in known devices, but mechanical or physical defects on the finished printing plate cannot be excluded .

In der DE-A1-2 516 884 ist eine Entnahmevorrichtung für gestapelte Glasscheiben beschrieben, die einen schwenkbaren Hubzylinder mit einer Kolbenstange aufweist, die einen Saugteller vor- und zurückbewegt. Der Hubzylinder ist mit einem Schenkel eines winkelförmigen Schwenkarms verbunden, dessen Schwenkbewegung von einem Getriebemotor ausgehend, über eine Drehkurbel, eine Schubstange sowie eine weitere Drehkurbel übertragen wird, die über eine Welle mit dem Schwenkarm in Verbindung steht.DE-A1-2 516 884 describes a removal device for stacked glass panes which has a pivotable lifting cylinder with a piston rod which moves a suction plate back and forth. The lifting cylinder is connected to one leg of an angular swivel arm, the swiveling movement of which is transmitted from a geared motor, is transmitted via a rotating crank, a push rod and a further rotating crank, which is connected to the swivel arm via a shaft.

Aus der DE-A1-2160765 ist ebenfalls ein schwenkbarer Hubzylinder mit einer Kolbenstange bekannt, die einen hin- und herverfahrbaren Saugteller trägt, der Glasscheiben von einem Stapel abhebt, wobei der Hubzylinder zwischen einer Aufnahme- und einer Absetzposition um eine Drehachse verschwenkt wird.From DE-A1-2160765 a pivotable lifting cylinder with a piston rod is also known which carries a reciprocating suction plate which lifts glass panes from a stack, the lifting cylinder being pivoted about an axis of rotation between a receiving and a depositing position.

Aus der veröffentlichten europäischen Patentanmeldung 0 000 048 ist eine Transportstation für Druckplatten bekannt, die einen Stapelbereich umfaßt, in dem sich ein Vorrat an Druckplatten befindet. Für die zwischen jeweils zwei Platten vorhandenen Papierblätter ist eine Papierablage vorhanden. Die Druckplatten werden durch einen Steuerungsmechanismus, der eine Anzahl von Saugnäpfen aufweist, vom Stapelbereich zu einem Förderband transportiert. Der Steuerungsmechanismus ist schwenkbar an einer Führungsstange befestigt, die über ein Getriebe mit einem Motor verbunden ist, um eine seitliche Gleitbewegung vor und zurück ausführen zu können. Die oberste Druckplatte wird von zumindest vier Saugnäpfen des Steuerungsmechanismus angesaugt. Dann schwenkt der Steuerungsmechanismus nach oben und gleichzeitig wird die Führungsstange mechanisch auf das Förderband hinbewegt. Wird das Vakuum in den Saugnäpfen aufgehoben, senkt sich der Steuerungsmechanismus nach unten ab und legt die Druckplatte auf dem Förderband ab. Ein zweiter Steuerungsmechanismus oberhalb des Papierzwischenblattes ergreift das Papierblatt, hebt es ab und befördert es zu der Papierablage.From the published European patent application 0 000 048 a transport station for printing plates is known which comprises a stacking area in which there is a supply of printing plates. A paper tray is available for the paper sheets between two plates. The pressure plates are transported from the stacking area to a conveyor belt by a control mechanism that has a number of suction cups. The control mechanism is pivotally attached to a guide rod which is connected to a motor via a gear in order to be able to perform a lateral sliding movement back and forth. The uppermost pressure plate is sucked in by at least four suction cups of the control mechanism. Then the control mechanism pivots upwards and at the same time the guide rod is mechanically moved onto the conveyor belt. If the vacuum in the suction cups is released, the control mechanism lowers down and places the pressure plate on the conveyor belt. A second control mechanism above the intermediate paper sheet grabs the paper sheet, lifts it up and conveys it to the paper tray.

Das Förderband transportiert die Druckplatte auf eine Belichtungsbühne, die eine Anzahl von Löchern in ihrer Oberfläche aufweist und eine Kammer bildet, die über eine Saugleitung mit einer Vakuumpumpe verbunden ist. Die Druckplatte wird, nachdem sie die richtige Stellung auf der Oberfläche der Belichtungsbühne eingenommen hat, durch Erzeugen eines Vakuums auf dieser festgehalten. Die Druckplatte wird mit Hilfe eines Belichtungssystems belichtet, das einen beweglichen Wagenschlitten aufweist, an dem eine Coronaaufladevorrichtung und ein Licht reflektierender Spiegel angeordnet sind. Ein Laser für die Abstrahlung von modulierten Laserlicht ist so angeordnet, daß der von dem Laser ausgesandte Lichtstrahl von dem Spiegel abgelenkt wird und in einer Ebene etwa senkrecht zu der Oberfläche der auf der Belichtungsbühne aufliegenden Druckplatte auftrifft.The conveyor belt transports the printing plate onto an exposure stage which has a number of holes in its surface and forms a chamber which is connected to a vacuum pump via a suction line. The printing plate, after it has taken the correct position on the surface of the exposure stage, is created by creating a vacuum this held. The printing plate is exposed using an exposure system which has a movable carriage carriage on which a corona charging device and a light-reflecting mirror are arranged. A laser for the emission of modulated laser light is arranged in such a way that the light beam emitted by the laser is deflected by the mirror and strikes in a plane approximately perpendicular to the surface of the printing plate lying on the exposure stage.

Auch bei dieser Stapelung der Druckplatten in einem Magazin mit der beschichteten fotoleitfähigen Schicht nach oben ist nicht ausgeschlossen, daß beim Öffnen des Geräts bzw. beim Nachfüllen des Stapels eine Vorbelichtung der zuoberst liegenden Druckplatte erfolgt, die sich bei der späteren Belichtung und Entwicklung der Druckplatte negativ auf die Qualität der druckfertigen Platte auswirken kann. Ebenso wie im zuvor erwähnten Stand der Technik muß beim Abheben der obersten Druckplatte vom Stapel die fotoleitfähige Schicht der Druckplatte mit Saugeinrichtungen berührt werden, was zu mechanischen oder physikalischen Fehlstellen auf der fertigen Druckplatte führen kann.Even with this stacking of the printing plates in a magazine with the coated photoconductive layer on top, it is not excluded that when the device is opened or when the stack is refilled, the printing plate on the top is pre-exposed, which is negative during the subsequent exposure and development of the printing plate can affect the quality of the print-ready plate. As in the aforementioned prior art, when lifting the top printing plate from the stack, the photoconductive layer of the printing plate must be touched with suction devices, which can lead to mechanical or physical defects on the finished printing plate.

Aufgabe der Erfindung ist es, eine Vorrichtung der eingangs beschriebenen Art so zu verbessern, daß die beschichtete fotoleitende Seite der Druckplatte während des Transports von dem Plattenmagazin zu der Belichtungsbühne mechanisch nicht berührt wird und gegen eine Vorbelichtung weitgehend geschützt ist.The object of the invention is to improve a device of the type described at the outset so that the coated photoconductive side of the printing plate is not mechanically touched during transport from the plate magazine to the exposure stage and is largely protected against pre-exposure.

Diese Aufgabe wird erfindungsgemäß durch eine Vorrichtung der eingangs beschriebenen Art dadurch gelöst, daß ein um eine Achse schwenkbarer Hubzylinder mit einer aus dem Hubzylinder aus- und in diesen einfahrbaren Kolbenstange ausgerüstet ist, die an der unbeschichteten Seite der Druckform angreifende Saugelemente für das Ansaugen und Absetzen der obersten Druckform des Stapels trägt und daß oberhalb des Magazins eine Luftdüse angeordnet ist, deren Luftstrom nahezu tangential auf die beschichtete Seite der Druckform gerichtet ist, sobald der Hubzylinder die Druckform von dem Stapel abhebt, um ein Blatt zum Schutz der beschichteten Seite der Druckform gegen Beschädigungen von der Druckform abzulösen.This object is achieved in accordance with the invention by a device of the type described in the introduction in that a lifting cylinder which can be pivoted about an axis is equipped with a piston rod which can be moved out of and into the lifting cylinder and which acts on the uncoated side of the printing form for suction elements for suction and settling carries the uppermost printing form of the stack and that an air nozzle is arranged above the magazine, the air flow of which is directed almost tangentially to the coated side of the printing form as soon as the lifting cylinder lifts the printing form from the stack to protect a sheet against the coated side of the printing form Detach damage from the printing form.

In Ausgestaltung der Erfindung sind die Saugelemente zum Ansaugen, Festhalten und Absetzen der Druckform auf eine horizontale Förderbahn auf einer schüsselförmigen Platte angeordnet, die als Halterung der Saugelemente mit der Kolbenstange verbunden ist. Diese Förderbahn kann ein Tisch sein, längs dem die Druckform zu einem dahinter angeordneten Belichtungstisch transportiert wird. In Weiterbildung der Erfindung ist das Magazin geneigt zur Senkrechten angeordnet, wobei der Hubzylinder in seiner Aufnahmeposition senkrecht auf die unbeschichtete Seite der obersten Druckform gerichtet ist und die schüsselförmige Platte parallel zu der unbeschichteten Seite der Druckform verläuft und auf diese zum Abheben der obersten Platte von dem Stapel soweit abgesenkt wird, bis daß die Saugelemente auf der Druckform aufsitzen.In one embodiment of the invention, the suction elements for sucking, holding and depositing the printing form on a horizontal conveyor track are arranged on a bowl-shaped plate which is connected to the piston rod as a holder for the suction elements. This conveyor track can be a table, along which the printing form is transported to an exposure table arranged behind it. In a further development of the invention, the magazine is arranged inclined to the vertical, the lifting cylinder in its receiving position being directed perpendicularly onto the uncoated side of the uppermost printing form and the bowl-shaped plate running parallel to the uncoated side of the printing form and onto this for lifting the top plate from the latter The stack is lowered until the suction elements are seated on the printing form.

Die vorteilhafte Weiterbildung der Erfindung ergibt sich aus den Merkmalen der Ansprüche 4 bis 6.The advantageous development of the invention results from the features of claims 4 to 6.

Mit der Erfindung wird der Vorteil erzielt, daß die Druckform, beispielsweise eine Druckplatte, die mit ihrer fotoleitfähigen beschichteten Seite nach unten im Plattenstapel liegt, mittels des drehbaren Schwenkzylinders bzw. Hubzylinders an ihrer unbeschichteten Seite angesaugt und in eine waagerechte Position gebracht wird, in der ihre beschichtete Seite nach oben zeigt und in dieser Position der Transport zu dem Belichtungstisch erfolgt. Dadurch ist sichergestellt, daß die fotoleitfähige Schicht der Druckplatte während des gesamten Transportes von dem Plattenmagazin zu der Belichtungsbühne weder mechanisch berührt noch vorbetichtet wird.With the invention, the advantage is achieved that the printing form, for example a printing plate, which lies with its photoconductive coated side down in the plate stack, is sucked in by means of the rotatable swivel cylinder or lifting cylinder on its uncoated side and brought into a horizontal position in which its coated side faces up and in this position the transport to the exposure table takes place. This ensures that the photoconductive layer of the printing plate is neither mechanically touched nor pre-exposed during the entire transport from the plate magazine to the exposure stage.

Ein Ausführungsbeispiel der Erfindung wird anhand der Zeichnung näher erläutert.An embodiment of the invention is explained in more detail with reference to the drawing.

Die einzige Figur zeigt in schematisierter Darstellung verschiedene Bearbeitungsstationen einer Vorrichtung zur Abbildung einer Vorlage auf der fotoleitenden Oberfläche einer Druckplatte. Eine Transportstation für die Druckplatten 9 umfaßt einen schwenkbaren Hubzylinder 2 mit einer aus dem Hubzylinder aus- und in diesen einfahrbaren Kolbenstange 7. Die Druckplatten 9 sind in einem Magazin 10 in der Weise gestapelt, daß jede einzelne Druckplatte innerhalb eines Stapels 1 mit ihrer fotoleitfähigen beschichteten Seite nach unten zu liegen kommt. Die Druckplatten sind mit einem Blatt 19 aus Papier, Kunststoff, Folie oder dgl. Material auf ihrer Unterseite versehen, so daß dieses Blatt jeweils zwischen zwei Druckplatten 9 zu liegen kommt. Die Kolbenstange 7 trägt an dem aus dem Hubzylinder 2 herausragenden Ende eine schüsselförmige Platte 8, an der mehrere Saugelemente 3 befestigt sind. Der Hubzylinder ist um einen Drehpunkt 11 aus einer schrägen Lage in eine vertikale Lage verschwenkbar, wie dies durch den Doppelpfeil A-A angezeigt ist.The single figure shows a schematic representation of various processing stations of a device for imaging a template on the photoconductive surface of a printing plate. A transport station for the printing plates 9 comprises a pivotable lifting cylinder 2 with a piston rod 7 which can be moved out of and into the lifting cylinder. The printing plates 9 are stacked in a magazine 10 in such a way that each individual printing plate within a stack 1 is coated with its photoconductive material Comes to lie side down. The printing plates are provided with a sheet 19 of paper, plastic, film or the like material on their underside, so that this sheet comes to rest between two printing plates 9. The piston rod 7 carries at the end protruding from the lifting cylinder 2 a bowl-shaped plate 8 to which a plurality of suction elements 3 are fastened. The lifting cylinder can be pivoted about a pivot point 11 from an oblique position into a vertical position, as is indicated by the double arrow A-A.

Das Magazin 10 ist zur Senkrechten geneigt angeordnet und an seinem oberen Ende ist an einem abgewinkelten Trägerarm 20 eine Luftdüse 13 vorgesehen. Die Luftdüse 13 ist derart ausgerichtet, daß der Luftstrom nahezu tangential auf die Unterseite der Druckplatte 9 gerichtet ist, sobald der Hubzylinder 2 die Druckplatte von dem Stapel 1 abhebt. Der Hubzylinder 2 ist in seiner Aufnahmeposition so um den Drehpunkt 11 geschwenkt, daß er senkrecht auf die unbeschichtete Seite der obersten Druckplatte 9 gerichtet ist. Dabei verläuft die schüsselförmige Platte 8 parallel zu der unbeschichteten Seite der Druckplatte 9 und wird auf diese aufgesetzt. Danach werden die Saugelemente 3 zum Ansaugen und Festhalten der Druckplatte 9 mit Unterdruck beaufschlagt und die Kolbenstange 7 in den Hubzylinder zum Teil eingefahren, bis die Druckplatte 9 die in der Zeichnung gestrichelt dargestellte Position einnimmt. In dieser Stellung hat der nahezu tangential auf die fotoleitfähige Schicht auf der Unterseite der Druckplatte 9 gerichtete Luftstrom aus der Luftdüse 13 das Blatt 19, das die beschichtete Seite der Druckplatte 9 gegen Beschädigungen schützt, zum größten Teil von der Unterseite der Druckplatte 9 abgelöst. Das Blatt 19, im allgemeinen ein Papierblatt, wird von dem Luftstrom in eine unterhalb des Belichtungstisches 4 angeordnete Auffangwanne 21 geblasen. Anschließend wird der Hubzylinder 2 um den Drehpunkt 11 in seine vertikale Stellung geschwenkt, so daß die Druckplatte 9 in der Ebene einer Förderbahn 12 zu liegen kommt. Dabei ist der Schwenkwinkel des Hubzylinders 2 von der schrägen Aufnahmeposition der Druckplatte 9 im Magazin 10 bis zur horizontalen Absetzposition auf der Förderbahn 12 größer als 90° und liegt im allgemeinen in einem Bereich zwischen 120° bis 150°. In der Ebene der Förderbahn 12 liegen Rollen 14, die eine Rille aufweisen. Diese Rollen liegen mit den Rillen an den sich gegenüberliegenden Längsseitenkanten der Druckplatte 9 an. Sobald der Unterdruck in den Saugelementen 3 aufgehoben wird, erfolgt die Freigabe der Druckplatte 9 und die angetriebenen Rollen 14 transportieren die Druckplatte 9 längs der Förderbahn 12 auf den Belichtungstisch 4. Die Druckplatte 9 kommt auf dem Belichtungstisch 4 auf einer Vakuumplatte zu liegen und sobald sie ihre Position auf dem Belichtungstisch 4 eingenommen hat, wird sie durch Erzeugen eines Vakuums auf diesem festgehalten. Oberhalb des Belichtungstisches 4 befindet sich ein horizontal verfahrbarer Belichtungswagen 16, der optische Einrichtungen zum Abtasten einer Vorlage 18 und zum Belichten der Druckplatte 9 trägt. Da es sich bei diesen Bearbeitungsstationen um bekannte Vorrichtungen handelt, werden sie nicht näher beschrieben.The magazine 10 is arranged inclined to the vertical and at its upper end an air nozzle 13 is provided on an angled support arm 20. The air nozzle 13 is aligned such that the air flow is directed almost tangentially to the underside of the pressure plate 9 as soon as the lifting cylinder 2 lifts the pressure plate from the stack 1. In its receiving position, the lifting cylinder 2 is pivoted about the pivot point 11 in such a way that it is directed perpendicularly onto the uncoated side of the uppermost printing plate 9. The bowl-shaped plate 8 runs parallel to the uncoated side of the pressure plate 9 and is placed on this. Then the suction elements 3 for sucking and holding the pressure plate 9 are subjected to negative pressure and the piston rod 7 is partially moved into the lifting cylinder until the pressure plate 9 assumes the position shown in broken lines in the drawing. In this position The air flow from the air nozzle 13 directed almost tangentially onto the photoconductive layer on the underside of the pressure plate 9 largely detaches the sheet 19, which protects the coated side of the pressure plate 9 from damage, from the underside of the pressure plate 9. The sheet 19, generally a sheet of paper, is blown by the air stream into a collecting trough 21 arranged below the exposure table 4. Then the lifting cylinder 2 is pivoted about the pivot point 11 into its vertical position, so that the pressure plate 9 comes to lie in the plane of a conveyor track 12. The swivel angle of the lifting cylinder 2 from the inclined receiving position of the pressure plate 9 in the magazine 10 to the horizontal setting position on the conveyor track 12 is greater than 90 ° and is generally in a range between 120 ° to 150 °. In the plane of the conveyor track 12 there are rollers 14 which have a groove. These rollers lie with the grooves on the opposite longitudinal side edges of the pressure plate 9. As soon as the negative pressure in the suction elements 3 is released, the pressure plate 9 is released and the driven rollers 14 transport the pressure plate 9 along the conveyor track 12 onto the exposure table 4. The pressure plate 9 comes to lie on the exposure table 4 on a vacuum plate and as soon as it is has taken its position on the exposure table 4, it is held in place by creating a vacuum. Above the exposure table 4 there is a horizontally movable exposure carriage 16, which carries optical devices for scanning an original 18 and for exposing the printing plate 9. Since these processing stations are known devices, they are not described in detail.

An der Unterseite des Belichtungswagens 16 ist eine Corona 15 befestigt, die beim horizontalen Verfahren des Belichtungswagens 16 die Druckplatte 9 auflädt, die anschließend dann belichtet wird. Nachdem die Druckplatte 9 belichtet ist, wird sie durch die Rollen 14 auf den Entwicklertisch 5 weitertransportiert. Der Entwicklertisch 5 ist mit einer darunter angeordneten Antriebswelle 6 verbunden, längs der er in Richtung des Doppelpfeils B-B horizontal hin- und herverschoben werden kann. Oberhalb des Entwicklertisches befindet sich eine Entwicklervorrichtung 17, die von oben her über eine Magnetbürste an die Oberfläche der Druckplatte 9 einen Entwicklerbelag, bestehend aus einer Mischung von Trägerteilchen und Toner, antreibt, während die Druckplatte 9 unterhalb der Entwicklervorrichtung 17 vorbeigeführt wird. Die entwickelte Druckplatte wird dann in eine nicht gezeigte Fixierungsvorrichtung transportiert, in welcher der bildmäßig verteilte Toner durch die Einwirkung von Strahlungswärme auf der Druckplattenoberfläche fixiert bzw. auf ihr aufgeschmolzen wird. Von der Fixiervorrichtung gelangt die bebilderte Druckplatte anschließend zu einer Entschichtungsvorrichtung, in der die Bildstellen auf der fotoleitenden Schicht entfernt werden, so daß die Druckplatte danach für den Einsatz in einer Offset-Druckmaschine geeignet ist.A corona 15 is fastened to the underside of the exposure carriage 16, which charges the printing plate 9 when the exposure carriage 16 is moved horizontally, which plate is then exposed. After the printing plate 9 has been exposed, it is transported on to the developer table 5 by the rollers 14. The developer table 5 is connected to a drive shaft 6 arranged underneath, along which it can be horizontally pushed back and forth in the direction of the double arrow B-B. Above the developer table is a developer device 17, which drives a developer coating consisting of a mixture of carrier particles and toner from above via a magnetic brush to the surface of the printing plate 9, while the printing plate 9 is guided past the developer device 17. The developed printing plate is then transported to a fixing device, not shown, in which the imagewise distributed toner is fixed or melted on the printing plate surface by the action of radiant heat. The imaged printing plate then passes from the fixing device to a stripping device in which the image areas on the photoconductive layer are removed, so that the printing plate is then suitable for use in an offset printing machine.

Claims (6)

1. A mechanism for transporting printing plates from a plate holder in which they are stacked to an exposure station, with the aid of suction air, characterized in that a swivelling lifting cylinder (2) swivelable about a pivotal point (11) is equipped with a piston rod (7) which may be extended from and retracted into the lifting cylinder which is carrying suction elements (3) which are engaging the uncoated side of the printing form for gripping by suction and depositing the uppermost printing form (9) of the stack (1) and in that an air jet (13) is arranged above the plate holder (10), the air stream of which is almost tangentially directed to the coated side of the printing form (9), as soon as the lifting cylinder (2) picks up the printing form (9) from the stack (1), whereby a sheet (19) protecting the coated side of the printing form (9) from damage, is detached from the printing form (9).
2. A mechanism as claimed in claim 1, characterized in that the suction elements (3) for suction, retaining and depositing the printing form (9) on a horizontal conveyor track (12) are arranged on a dish-shaped plate (8)% which is connected, as holder of the suction elements, to the piston rod.
3. A mechanism as claimed in claim 1 and claim 2, characterized in that plate holder (10) is arranged in inclined position with respect to the perpendicular, wherein the lifting cylinder (2), in its receiving position, points vertically to the uncoated side of the uppermost printing form (9) and in that the dishshaped plate (8) extends parallel to the uncoated side of the printing form (9) and is lowered so far on the printing form in order to pick up the uppermost printing form (9), that the suction elements (3) are seating on the printing form.
4. A mechanism as claimed in claims 1 to 3, characterized in that the swivelling angle of the lifting cylinder (2) between the inclined receiving position of the printing form (9) in the plate holder (10) and the horizontal depositing position of the printing form (9) on the conveyor track (12) is greater than 90.
5. A mechanism as claimed in claims 1 to 4, characterized in that in the depositing position of the printing form (9), the dish-shaped plate (8) of the lifting cylinder (12) extends horizontally, the photoconductive layer of the printing form (9) retained by the suction elements (3) faces upwards and in that the uncoated side of the printing form (9) is on a level with an exposure table (4) on which the printing form (9) is transported by rollers (14).
6. A mechanism as claimed in claims 1 to 5, characterized in that the grooved rollers (14) are positioned in the plane of the conveyor track (12), the grooves of which are engaging the opposite longitudinal edges of the printing form (9) during transport of the printing form (9) to the exposure table (4).
EP81102231A 1980-04-02 1981-03-25 Apparatus for transporting printing plates Expired EP0037064B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3012815 1980-04-02
DE19803012815 DE3012815A1 (en) 1980-04-02 1980-04-02 DEVICE FOR TRANSPORTING PRINTING FORMS

Publications (3)

Publication Number Publication Date
EP0037064A2 EP0037064A2 (en) 1981-10-07
EP0037064A3 EP0037064A3 (en) 1982-09-08
EP0037064B1 true EP0037064B1 (en) 1985-03-06

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ID=6099098

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EP81102231A Expired EP0037064B1 (en) 1980-04-02 1981-03-25 Apparatus for transporting printing plates

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US (1) US4402592A (en)
EP (1) EP0037064B1 (en)
JP (1) JPS56153349A (en)
AU (1) AU532030B2 (en)
CA (1) CA1190949A (en)
DE (2) DE3012815A1 (en)

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Also Published As

Publication number Publication date
EP0037064A3 (en) 1982-09-08
US4402592A (en) 1983-09-06
AU532030B2 (en) 1983-09-15
CA1190949A (en) 1985-07-23
DE3169155D1 (en) 1985-04-11
AU6892881A (en) 1981-10-08
EP0037064A2 (en) 1981-10-07
DE3012815A1 (en) 1981-10-08
JPS56153349A (en) 1981-11-27

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